Experimental observation of an enhanced anisotropic magnetoresistance in non-local configuration

Details Experimental observation of an enhanced anisotropic magnetoresistance in non-local configuration Experimental observation of an enhanced anisotropic magnetoresistance in non-local configuration

2011-08-10

arxiv.org/abs/1108.2125v1

Appl. Phys. Lett. 99, 142112 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.3640487

We compare non-local magnetoresistance measurements in multi-terminal Ni nanostructures with corresponding local experiments. In both configurations, the measured voltages show the characteristic features of anisotropic magnetoresistance (AMR). However, the magnitude of the non-local AMR signal is up to one order of magnitude larger than its local counterpart. Moreover, the non-local AMR increases with increasing degree of non-locality, i.e., with the separation between the region of the main current flow and the voltage measurement region. All experimental observations can be consistently modeled in terms of current spreading in a non-isotropic conductor. Our results show that current spreading can significantly enhance the magnetoresistance signal in non-local experiments.

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